Enables nuclear receptor coactivator activity. Acts upstream of or within mitotic cell cycle; regulation of protein modification process; and regulation of protein stability. Located in mitotic spindle and nucleus. Part of ATAC complex and SAGA complex. Is expressed in eye; ureteric tip; and ureteric trunk. Orthologous to human TADA3 (transcriptional adaptor 3). [provided by Alliance of Genome Resources, Apr 2022]